Writing Algebraic Expressions from Statements

The video tutorial explains how to translate tables into algebraic expressions by using variables to represent unknown numbers. It covers expressions involving sums, differences, and multiples for various scenarios such as length, cost, quantity, time, and distance. The tutorial emphasizes understanding the meaning of operations like addition, subtraction, and multiplication in the context of algebraic expressions.

What variable is used to represent an unknown number?

• z

• n

• y

• x

How do you express the sum of a number and three?

• n + 3

• 3 + n

• n - 3

• 3 - n

What is the expression for twice the sum of a number and three?

• 2n + 6

• 2(n + 3)

• n + 6

• 2n + 3

Which variable is used to represent an unknown length?

• l

• d

• w

• h

How do you express double the length decreased by six?

• 2(l - 6)

• 2l - 6

• 2l + 6

• l - 6

What is the expression for the difference of the cost and twenty?

• c - 20

• 20 - c

• 20 + c

• c + 20

How do you express the difference of five and a quantity?

• 5 + q

• 5 - q

• q + 5

• q - 5

What is the expression for the difference of five and a quantity, divided by two?

• (5 / 2) - q

• 5 / 2 - q

• 5 - q / 2

• (5 - q) / 2

Which variable is used to represent an amount of time?

• t

• d

• m

• h

How do you express the sum of negative four and twice the distance?

• 2d - 4

• d - 4

• -4 + 2d

• -4 + d